A constant pressure water supply pump for water supply

Abstract

The present application discloses a water supply constant pressure pump for water supply, which continuously rotates the annular filter screen, and the circular plate drives the cleaning component to rotate synchronously, so that the passive magnet intermittently faces the strong magnet uniformly distributed on the circumference, and drives the brush to move in the direction of the front sealing plate under the attraction of the strong magnet. After leaving the strong magnet, the reset spring will drive the brush to move in the direction of the rear sealing plate, so that the brush performs reciprocating motion, scrubbing the inner side of the annular filter screen, and keeping the annular filter screen clean. At the same time, when the annular filter screen rotates, the filter area that gradually leaves the liquid collecting cavity will entrain a part of the water to remain. When the brush in this filter area performs reciprocating linear motion, the retained water will cooperate with the brush to scrub the part in the filter area of ​​the annular filter screen, and cooperate with the brush to stir the water so that the cleaned impurities can float in the water, and eventually can be discharged through the drain outlet along with the water in this filter area, keeping the filter area clean.

Description

Technical Field

[0001] The present application relates to the technical field of constant pressure water supply, and in particular to a constant pressure water supply pump for water supply. Background Art

[0002] In different water supply processes, depending on the demand situation, the water pressure needs to be constant to maintain a constant pressure water supply effect. This requires the use of a constant pressure water pump to regulate and stabilize the water pressure. For long-term water pumping, it is necessary to install a filter device in the pipe before the water inlet of the water pump to intercept impurities in the water and prevent impurities from adhering to and clogging the constant pressure pump, resulting in the constant pressure pump being unable to effectively regulate its own water pressure.

[0003] However, if the filter device is not cleaned after long-term use, a large amount of dirt or impurities will still adhere to the filter device, causing the filter device to be blocked, reducing the water flow, and still affecting the water pressure regulation of the constant pressure water pump. For this reason, it is necessary to frequently shut down the machine to remove, replace and clean the filter device. However, during the shutdown process, the constant pressure water pump will stop supplying water and cannot meet the demand for continuous water supply. Summary of the Invention

[0004] The present application proposes a constant pressure water supply pump, which has the advantages of water flow impacting the impeller to drive the annular filter to rotate, the passive magnet intermittently approaches the strong magnet and cooperates with the reset spring to drive the brush to reciprocate, the reciprocating brush brushes the annular filter, the retained water in the filter area cooperates with the brush to brush the impurities, and the passive magnet intermittently approaches the strong magnet to squeeze the elastic hose for backwashing, so as to solve the problem of impurities adhering to the pre-filter device of the existing constant pressure pump, which requires shutdown for cleaning.

[0005] To achieve the above objectives, the present application adopts the following technical solution: a constant pressure water supply pump for water supply, comprising:

[0006] Constant pressure pump, the inlet is equipped with a changing pipe;

[0007] The filter box has a liquid collecting box on the top that is connected to the changing pipe, and a placement tank is provided in the filter box;

[0008] An annular filter screen is sleeved in the placement tank to filter water, and a circular plate is provided on one side of the annular filter screen;

[0009] Isolation plates are evenly distributed on the inner wall of the annular filter screen to form a filtering area;

[0010] The impeller is sleeved in the deflection pipe to receive the impact of the water flow. The impeller is provided with a rotating shaft connected to the circular plate to drive the annular filter to rotate;

[0011] The front sealing plate is arranged at the notch of the placement groove for sealing. A central column is set at the center of one side of the front sealing plate facing the bottom of the placement groove to isolate the filtration area. The top and bottom of the front sealing plate are respectively provided with a water inlet and a sewage pipe connected to the placement groove. A drainage port is provided in the sewage pipe for the input and output of water.

[0012] Preferably, the outer circumferential surface of the annular filter screen is in contact with the circumferential wall of the placement groove, so as to limit the flow direction of water in the filter area.

[0013] Preferably, an annular rotating groove is provided on a side of the filter box away from the front sealing plate, and strong magnets evenly distributed around the circumference are provided at the bottom of the rotating groove.

[0014] Preferably, the notch of the rotating groove is provided with a rear sealing plate.

[0015] Preferably, a circumferentially evenly distributed cleaning component is provided in the filter box, and the cleaning component includes two axially evenly distributed brushes arranged in the filter area, a sliding rod connecting the two brushes and passing through the filter box to the rotating groove, and a passive magnet connected to one end of the sliding rod located in the rotating groove, which is used to brush the inner wall of the annular filter screen.

[0016] Preferably, the passive magnet is attracted to the strong magnet, and a return spring is provided on the slide rod for driving the cleaning assembly to perform reciprocating motion to scrub the annular filter screen.

[0017] Preferably, an elastic hose is provided in the filter box, which passes through the bottom of the rotating groove and is located between the passive magnet and the strong magnet, and is used to receive the backwash water squeezed and pumped by the passive magnet.

[0018] Preferably, a liquid distribution pipe is provided at the bottom of the filter box near the sewage pipe, and an axially uniformly distributed injection port is opened on the side of the liquid distribution pipe facing the annular filter screen. One side of the elastic hose is connected to the liquid distribution pipe for backwashing the part through which the annular filter screen passes.

[0019] Preferably, the slide rod is provided with two annular grooves, and the center of the brush is provided with a sliding hole which is sleeved outside the annular grooves to provide space for the brush to move up and down.

[0020] Preferably, symmetrical traction ropes are provided on both sides of the top of the brush, and the tops of the traction ropes are connected to air bags for providing power for the up and down movement of the brush and forming movement differences of the surrounding liquid.

[0021] The present application provides a constant pressure water supply pump for water supply. When the constant pressure pump pumps water, the flowing water impacts the impeller, driving the annular filter to rotate continuously, so that the part of the annular filter that filters water is in a constantly changing process, so that the relatively clean part of the annular filter is always connected to the liquid collection box to filter the pumped water.

[0022] At the same time, during the continuous rotation of the annular filter, the cleaning component will be driven to rotate synchronously through the circular plate, so that the passive magnet will intermittently face the strong magnets evenly distributed around the circumference, thereby driving the brush to move toward the front sealing plate under the attraction of the strong magnet. After the passive magnet moves away from the strong magnet, it will be driven by the reset spring to move the brush toward the rear sealing plate, so that the brush will move back and forth to brush the inner side of the annular filter and keep the annular filter clean.

[0023] At the same time, during the rotation of the annular filter, the filter area that gradually leaves the liquid collection chamber will carry a portion of water and remain in this filter area. When the brush in this filter area performs reciprocating linear motion, the retained water will cooperate with the brush to scrub the part in this filter area of ​​the annular filter. The brush stirs the water so that the impurities removed can float in the water and eventually be discharged through the drain outlet along with the water in this filter area, keeping this filter area clean.

[0024] At the same time, when the passive magnet moves toward the direction of the strong magnet, the elastic hose is squeezed, so that the flushing water in the elastic hose is pumped into the liquid distribution pipe, and under the thrust of the subsequent pumped water, it is sprayed from the injection port to the outer side of the annular filter screen, backwashing this part of the annular filter screen, and coordinating with the movement of the brush to further improve the cleaning ability. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments disclosed herein and, together with the description, serve to explain the principles disclosed herein.

[0026] The present disclosure can be more clearly understood from the following detailed description with reference to the accompanying drawings, in which:

[0027] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0028] Figure 2 This is a schematic diagram of the filter box of the present invention;

[0029] Figure 3 Schematic diagram of the internal structure distribution of the present invention;

[0030] Figure 4 This is a schematic diagram of the internal structure of the filter box of the present invention;

[0031] Figure 5 This is a schematic diagram of the front sealing plate structure of the present invention;

[0032] Figure 6 This is a schematic diagram of the structural position of the annular filter and the cleaning assembly of the present invention;

[0033] Figure 7 This is a schematic structural diagram of the cleaning component of the present invention;

[0034] Figure 8 This is a schematic diagram of the structure of the elastic hose and liquid distribution pipe of this application;

[0035] Figure 9 This is a schematic diagram of the airbag structure position of the present invention;

[0036] Figure 10 Schematic diagram of the ring groove structure of the present invention;

[0037] Figure 11 This is a schematic diagram of the position of the sliding hole structure on the brush of the present invention.

[0038] Among them: 1. Constant pressure pump; 2. Filter box; 3. Placement tank; 31. Rotating tank; 4. Liquid collecting box; 5. Direction change pipe; 6. Rear sealing plate; 7. Front sealing plate; 71. Center column; 8. Water inlet; 9. Sewage pipe; 91. Drain outlet; 10. Circular plate; 11. Annular filter screen; 12. Isolation plate; 13. Rotating shaft; 14. Impeller; 15. Strong magnet; 16. Passive magnet; 17. Sliding rod; 171. Ring groove; 18. Brush; 181. Sliding hole; 19. Return spring; 20. Elastic hose; 21. Liquid distribution pipe; 22. Injection nozzle; 23. Air bag; 24. Tow rope. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0040] Example 1

[0041] See also Figures 1 to 4 A constant pressure water supply pump for water supply includes a constant pressure pump 1. The input port of the constant pressure pump 1 is fixedly connected to a changing pipe 5 by bolts. A liquid collecting box 4 is welded to the end of the changing pipe 5 away from the constant pressure pump 1. The bottom end of the liquid collecting box 4 is fixedly connected to a filter box 2, so that when the constant pressure pump 1 is running, it can extract water from the filter box 2 through the changing pipe 5 and the liquid collecting box 4, forming rapid water pumping.

[0042] See Figures 3 to 5 A cylindrical placement groove 3 is provided on the side of the filter box 2 away from the changing pipe 5, and the bottom end opening of the collecting box 4 is connected to the top of the placement groove 3, so that the filtered water in the placement groove 3 can enter the collecting box 4.

[0043] The notch of the placement trough 3 is fixedly connected to the front sealing plate 7 by bolts, and a center column 71 is welded to the center of the side of the front sealing plate 7 facing the bottom of the placement trough 3. One end of the center column 71 facing the bottom of the placement trough 3 is fitted with the bottom of the placement trough 3. A water inlet 8 is provided on the top of the front sealing plate 7 and is connected to the placement trough 3, so that the water to be pumped can enter the filtration area in the placement trough 3 connected to the liquid collecting tank 4 through the water inlet 8, and be sucked into the liquid collecting tank 4 after being filtered in the filtration area.

[0044] A sewage pipe 9 is provided at the bottom of the front sealing plate 7, and a drain port 91 is provided in the sewage pipe 9 to connect with the placement tank 3, so that the sewage (water containing impurities) in the filter area that rotates to the bottom and connects with the drain port 91 can be discharged from the placement tank 3 through the drain port 91.

[0045] See Figure 2 , Figures 5 and 6 An annular filter screen 11 is movably sleeved in the placement groove 3, and the circumferential outer side of the annular filter screen 11 is in contact with the circumferential groove wall of the placement groove 3, so that only the part where the annular filter screen 11 is connected to the liquid collection box 4 can filter the water. At this time, the water passing through the water inlet 8 can enter the liquid collection box 4 after being filtered through this part.

[0046] The end of the annular filter 11 away from the front sealing plate 7 is fixedly connected to the circular plate 10, and the end of the circular plate 10 away from the front sealing plate 7 is in contact with the bottom of the placement groove 3 to prevent a large amount of waste water from accumulating at the bottom of the placement groove 3. The circumferentially uniformly distributed isolation plates 12 are welded on the inner circumference of the annular filter 11. The end of the isolation plate 12 away from the annular filter 11 is in contact with the circumferential side wall of the center column 71. The end of the isolation plate 12 close to the circular plate 10 is fixed to the circular plate 10. The end of the isolation plate 12 close to the front sealing plate 7 is in contact with the side of the front sealing plate 7 facing the circular plate 10. The adjacent two isolation plates are welded on the inner circumference of the annular filter 11. The space between the plates 12 forms a filter area, so that adjacent filter areas are generally in an isolated state. When one of the filter areas is connected to the water inlet 8 and the liquid collection tank 4, filtering will be performed on the annular filter mesh 11 of this filter area. When this filter area rotates and gradually leaves the water inlet 8, the next filter area will gradually be connected to the water inlet 8. During this period of time, there are two filter areas that are connected to the water inlet 8 at the same time, so that a part of the water will remain in the filter area that gradually rotates away from the water inlet 8. There is also a process in which the two filter areas are connected to the drain outlet 91 at the same time.

[0047] See Figure 3 , Figure 6, the center of one end of the circular plate 10 away from the front sealing plate 7 is fixedly connected with a rotating shaft 13, and the end of the rotating shaft 13 away from the circular plate 10 passes through the filter box 2 and the changing pipe 5 to the changing pipe 5. The end of the rotating shaft 13 located in the changing pipe 5 is fixedly sleeved with an impeller 14, so that when the water extracted by the constant pressure pump 1 passes through the impeller 14 quickly, it will impact the impeller 14 and drive the impeller 14 to rotate, so that the impeller 14 drives the circular plate 10 and the annular filter screen 11 to rotate synchronously through the rotating shaft 13, so that the position where the annular filter screen 11 is connected to the collecting box 4 is in a continuous changing process, so that Impurities in the water can only be squeezed on the connected part of the annular filter 11 for a short period of time when the annular filter 11 is connected to the liquid collecting tank 4. When this part leaves the liquid collecting tank 4, there will be no subsequent water to squeeze the impurities on this part of the annular filter 11, so that the force of the impurities adhering due to squeezing is weakened. At this time, the water retained in the filter area will change its direction of movement when rotating, flushing these low-adhesion impurities, cleaning the impurities from the annular filter 11, and then draining them away when connecting to the drain outlet 91. It should be noted that the discharged sewage will be collected.

[0048] Example 2

[0049] See also Figures 3 and 4 On the basis of the first embodiment, an annular rotating groove 31 is opened on the side of the filter box 2 away from the front sealing plate 7. The notch of the rotating groove 31 is fixedly connected to the rear sealing plate 6 by bolts, and the bottom of the rotating groove 31 is fixedly connected with strong magnets 15 evenly distributed around the circumference, so that after the rear sealing plate 6 is removed, the structure in the rotating groove 31 can be easily installed and disassembled.

[0050] See Figures 3 and 4 , Figures 6 and 7 Two axially evenly distributed brushes 18 are movably sleeved in the filter area, so that the two brushes 18 can scrub the inner wall of the annular filter 11 over a large area within a short distance of movement of the passive magnet 16.

[0051] The bristles of the brush 18 fit the inner wall of the annular filter 11, and the central axis of the brush 18 is fixedly connected to a slide rod 17, which passes through the circular plate 10 and the filter box 2 to the rotating groove 31. The end of the slide rod 17 located in the rotating groove 31 is fixedly connected to the passive magnet 16, and the passive magnet 16 is attracted to the strong magnet 15. A return spring 19 is movably sleeved on the slide rod 17, and one end of the return spring 19 is fixedly connected to the end of the slide rod 17 close to the passive magnet 16, and the other end fits the bottom of the rotating groove 31, so that the annular filter 11 will drive the passive magnet 16, the slide rod 17, and the brush 18 to rotate synchronously through the circular plate 10 during continuous rotation, so that the passive magnet 16 The intermittent and circumferentially evenly distributed strong magnets 15 are directly opposite to each other, so that the brush 18 is driven to move in the direction of the front sealing plate 7 under the attraction of the strong magnet 15. At this time, the return spring 19 will be compressed and energy will be stored. After the passive magnet 16 is away from the strong magnet 15, the return spring 19 will drive the brush 18 to move in the direction of the rear sealing plate 6, so that the brush 18 performs reciprocating motion, and cooperates with the water retained in the filter area to brush the inner side of the annular filter 11 to keep the annular filter 11 clean, so that the brush 18 stirs the water, and the impurities cleaned will float in the water, and eventually can be discharged through the drain outlet 91 with the water in this filter area, keeping this filter area clean.

[0052] It should be noted that when the filter area connected to the liquid collection tank 4 and the water inlet 8 is severely clogged, the amount of water passing through this filter area per unit time is reduced, and the impact force on the impeller 14 is reduced, so that the speed at which the impeller 14 drives the annular filter screen 11 to rotate is slowed down, and the speed at which the passive magnet 16 approaches or moves away from the strong magnet 15 is slowed down. At this time, the time that the passive magnet 16 is attracted by the strong magnet 15 increases, resulting in an increase in the distance that the passive magnet 16 moves toward the strong magnet 15, which increases the movement path of the brush 18, increases the brushing range, and improves the brushing effect.

[0053] At the same time, during this process, the compressed return spring 19 is in an unstable energy storage state because it prevents the two magnets from adsorbing together. At this time, the vibration of the constant pressure pump 1 will be transmitted to the return spring 19 through the changing tube 5, the collecting tank 4 and the filter box 2, and the impurity resistance of the brush 18 will also be transmitted to the return spring 19, so that the return spring 19 is in a state of continuous shaking, causing the brush 18 to be in a state of continuous shaking as well, thereby improving the cleaning of surrounding impurities by the brush 18 during shaking.

[0054] Example 3

[0055] See also Figures 1 to 4 , Figure 8On the basis of the second embodiment, an elastic hose 20 is fixedly sleeved in the filter box 2. The elastic hose 20 passes through the bottom of the rotating groove 31 and is located between the passive magnet 16 and the strong magnet 15. A liquid distribution pipe 21 is fixedly sleeved at the bottom of the filter box 2 near the sewage pipe 9. The liquid distribution pipe 21 is provided with axially uniformly distributed injection ports 22 on the side facing the annular filter screen 11. One side of the elastic hose 20 is connected to the liquid distribution pipe 21, and the other end is connected to the existing external water pipe, so that the passive magnet When the passive magnet 16 moves toward the direction of the strong magnet 15, it can squeeze the elastic hose 20. When the passive magnet 16 moves in the direction away from the strong magnet 15, the elastic hose 20 will be loosened. The elastic hose 20 recovers under the action of its own elastic force, so that the elastic hose 20 is in a continuous compression and expansion process, thereby extracting clean water from the external water pipe and pumping it into the liquid distribution pipe 21, and spraying it from the injection port 22 to the outside of the annular filter 11 to backwash this part of the annular filter 11.

[0056] It should be noted that the liquid distribution pipe 21 is close to the sewage pipe 9. At this time, the filter area for backwashing in the liquid distribution pipe 21 is still connected to the drain outlet 91, so that the sewage discharged by backwashing can be discharged through the drain outlet 91. It should be noted that when the filter area connected to the liquid collection tank 4 and the water inlet 8 is seriously blocked, the distance that the passive magnet 16 moves toward the strong magnet 15 increases, so that the single squeezing degree of the elastic hose 20 by the passive magnet 16 increases, so that the impact force of the backwash water rushing into the liquid distribution pipe 21 increases in a short time, and the water pressure sprayed from the injection port 22 increases, thereby improving the backwashing capacity.

[0057] It should be noted that the instructions are attached Figure 3 For example, the annular filter screen 11 rotates clockwise, that is, the filter area needs to pass through the drain outlet 91 first and then through the liquid distribution pipe 21, so that the sewage in the filter area is first discharged through the drain outlet 91. This filter area will remain relatively dry for backwashing and will not be affected by the retained water, resulting in a weakening of the backwashing effect.

[0058] Sealing layers are provided at all leak-prone areas.

[0059] Example 4

[0060] See also Figures 9 to 11 On the basis of the third embodiment, two annular grooves 171 are provided on the slide rod 17, and a sliding hole 181 is provided in the center of the brush 18. The sliding hole 181 is movably sleeved outside the annular groove 171. The width of the sliding hole 181 is equal to the inner diameter of the annular groove 171, so that the slide rod 17 will not separate from the brush 18 when performing a linear reciprocating motion, and can still drive the brush 18 to perform a linear reciprocating motion. The height of the sliding hole 181 is greater than the diameter of the slide rod 17, so that the up and down freedom of the brush 18 is not fixed, and can perform an up and down reciprocating motion.

[0061] Symmetrical traction ropes 24 are fixedly connected to both sides of the top of the brush 18, and an air bag 23 is fixedly connected to the top of the traction rope 24. The air bag 23 is in a mouth-like shape. When the filter area is connected to the liquid collection box 4, the liquid in the filter area here will push the air bag 23 here to move in the direction of the brush 18. At this time, the brush 18 is affected by the push of the liquid, and the bristles are tightly attached to the annular filter mesh 11. At this time, the reciprocating brush 18 enhances the brushing effect of the annular filter mesh 11.

[0062] When the filter area here continues to rotate, the impact force of the liquid is weakened, and the airbag 23 will gradually move toward the isolation plate 12 above and the center column 71 above due to the influence of buoyancy, so that the airbag 23 applies a force to the brush 18 away from the annular filter 11 through the traction rope 24, causing the brush 18 to move a certain distance away from the annular filter 11 under the limited restriction of the sliding hole 181. At this time, the fit between the bristles and the annular filter 11 is weakened, the gap increases, and the brushing effect will also be weakened. However, at this time, some of the impurities remaining between the bristles will also be discharged in the enlarged gap, especially the clean water sprayed from the jet port 22 will also flush the bristles with enlarged gaps. It should be noted that the clean water sprayed on the bristles will also apply thrust to the brush 18, causing the gap to further increase, thereby ensuring the long-term use ability of the bristles.

[0063] At the same time, during the linear reciprocating motion of the brush 18, the airbag 23 will be pulled to move in the same direction through the traction rope 24. However, due to the resistance of the liquid, the movement of the airbag 23 will have a lag. This lag causes the deformation of the airbag 23, and also causes the action of the airbag 23 stirring the surrounding liquid to be different from the action of the brush 18 stirring the surrounding liquid. As a result, the flow direction of the liquid close to the airbag 23 and the liquid close to the brush 18 are different, thereby improving the floating effect of impurities in the liquid, and at the same time, the liquid away from the brush 18 can also obtain an effective stirring effect, thereby avoiding the problem that impurities away from the brush have poor floating effect in the liquid, excessive accumulation, and cannot be discharged with the liquid in time.

Claims

1. A constant pressure water pump for water supply, characterized in that: include: A constant pressure pump (1), the input port of which is provided with a direction-changing tube (5); A filter box (2) is provided with a liquid collecting box (4) on the top thereof and connected to a direction-changing pipe (5), and a placement tank (3) is provided in the filter box; An annular filter screen (11) is sleeved in the placement groove (3) to filter water, and a circular plate (10) is provided on one side of the annular filter screen (11); Isolation plates (12) are evenly distributed on the inner wall of the annular filter screen (11) to form a filtering area; An impeller (14) is sleeved in the deflection pipe (5) to receive the impact of the water flow. The impeller (14) is provided with a rotating shaft (13) connected to the circular plate (10) for driving the annular filter (11) to rotate; A front sealing plate (7) is provided at the notch of the placement tank (3) for sealing. A central column (71) is provided at the center of one side of the front sealing plate (7) facing the bottom of the placement tank (3) for isolating the filtration area. A water inlet (8) and a sewage pipe (9) are respectively provided at the top and bottom of the front sealing plate (7) for connecting to the placement tank (3). A drainage port (91) is provided in the sewage pipe (9) for inputting and outputting water. The filter box (2) is provided with an annular rotating groove (31) on a side away from the front sealing plate (7), and a strong magnet (15) is provided at the bottom of the rotating groove (31) and is evenly distributed around the circumference; a cleaning assembly is provided in the filter box (2), and the cleaning assembly includes two brushes (18) evenly distributed in the axial direction and arranged in the filter area, a slide rod (17) connecting the two brushes (18) and passing through the filter box (2) to the rotating groove (31), and a passive magnetic rod connected to one end of the slide rod (17) located in the rotating groove (31). The iron (16) is used to scrub the inner wall of the annular filter (11); the passive magnet (16) and the strong magnet (15) are attracted to each other, and the slide bar (17) is provided with a return spring (19) for driving the cleaning component to perform reciprocating motion to scrub the annular filter; an elastic rubber hose (20) is provided in the filter box (2), and the elastic rubber hose (20) passes through the bottom of the rotating groove (31) and is located between the passive magnet (16) and the strong magnet (15), and is used to receive the backwash water squeezed by the passive magnet (16).

2. A constant pressure water supply pump for water supply according to claim 1, characterized in that: The outer circumference of the annular filter screen (11) is in contact with the circumferential groove wall of the placement groove (3) to limit the flow direction of water in the filter area.

3. A constant pressure water supply pump for water supply according to claim 1, characterized in that: The notch of the rotating groove (31) is provided with a rear sealing plate (6).

4. A constant pressure water supply pump for water supply according to claim 1, characterized in that: A liquid distribution pipe (21) is provided at the bottom of the filter box (2) near the sewage pipe (9), and axially uniformly distributed injection ports (22) are opened on the side of the liquid distribution pipe (21) facing the annular filter screen (11). One side of the elastic rubber hose (20) is connected to the liquid distribution pipe (21) for backwashing the area passed by the annular filter screen (11).

5. A constant pressure water supply pump for water supply according to claim 4, characterized in that: The slide rod (17) is provided with two annular grooves (171), and the center of the brush (18) is provided with a sliding hole (181) which is sleeved outside the annular grooves (171) to provide space for the brush (18) to move up and down.

6. A constant pressure water supply pump for water supply according to claim 5, characterized in that: Symmetrical traction ropes (24) are provided on both sides of the top of the brush (18), and the top of the traction rope (24) is connected to an air bag (23) for providing power for the brush (18) to move up and down and form movement differences of the surrounding liquid.

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